Painted coffins with well-preserved mummies are displayed during a press conference at a makeshift exhibit at the feet of the Step Pyramid of Djoser in Saqqara, 24 kilometres (15 miles) southwest of Cairo. Egypt on Monday displayed a trove of ancient artefacts dating back 2,500 years that the country's antiquities authorities said were recently unearthed at the famed necropolis of Saqqara near Cairo.